Apple releases macOS Catalina 10.15.6 Supplemental Update

Apple today released macOS Catalina 10.15.6 supplemental update which includes bug fixes for your Mac.

macOS Catalina
macOS Catalina
• Fixes a stability issue that could occur when running virtualization apps

• Resolves an issue where an iMac (Retina 5K, 27-inch, 2020) may appear washed out after waking from sleep

Some features may not be available for all regions, or on all Apple devices.

For detailed information about the security content of this update, please visit:

MacDailyNews Take: On our Macs, macOS Catalina 10.15.6 Supplemental Update weighs in at 3.22GB.


  1. I’ve been affected by this bug for the last few weeks and it’s been enormously disruptive. I’m extremely disappointed and concerned that it was allowed to make it into production software and took this long to fix.

    Hopefully the update fixes the issue. I’m about to install.

      1. Would you believe it? I didn’t get the chance to find out. The installer hung and I couldn’t get it to unfreeze. So I’m now bypassing the dumpster fire that is Catalina and going straight to the Big Sur beta. I’ve been using Big Sur on a secondary laptop and my apps are running nicely. There are some odd quirks here and there, but at least the thing boots and doesn’t crash.

        It’s plausible that Catalina has been in such a crappy state because of engineers redeployed to Apple Silicon, but I won’t tolerate a similar level of quality in Big Sur. I’m going to watch the quality of Big Sur very carefully because I really don’t know why I pay a premium for Apple just to encounter these sorts of issues. I haven’t had to deal with this level of BS since I switched to Macs in 2005.

  2. After applying this fix, my Virtual Box VM is no longer leaking memory and my machine didn’t crash overnight. The fans seem to be running less as well on my MBP 16

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